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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"regexp"
"fmt"
"strings"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/store"
)
func (a *App) ProcessSlackText(text string) string {
text = expandAnnouncement(text)
text = replaceUserIds(a.Srv.Store.User(), text)
return text
}
// Expand announcements in incoming webhooks from Slack. Those announcements
// can be found in the text attribute, or in the pretext, text, title and value
// attributes of the attachment structure. The Slack attachment structure is
// documented here: https://api.slack.com/docs/attachments
func (app *App) ProcessSlackAttachments(a []*model.SlackAttachment) []*model.SlackAttachment {
var nonNilAttachments = model.StringifySlackFieldValue(a)
for _, attachment := range a {
attachment.Pretext = app.ProcessSlackText(attachment.Pretext)
attachment.Text = app.ProcessSlackText(attachment.Text)
attachment.Title = app.ProcessSlackText(attachment.Title)
for _, field := range attachment.Fields {
if field.Value != nil {
// Ensure the value is set to a string if it is set
field.Value = app.ProcessSlackText(fmt.Sprintf("%v", field.Value))
}
}
}
return nonNilAttachments
}
// To mention @channel or @here via a webhook in Slack, the message should contain
// <!channel> or <!here>, as explained at the bottom of this article:
// https://get.slack.help/hc/en-us/articles/202009646-Making-announcements
func expandAnnouncement(text string) string {
a1 := [3]string{"<!channel>", "<!here>", "<!all>"}
a2 := [3]string{"@channel", "@here", "@all"}
for i, a := range a1 {
text = strings.Replace(text, a, a2[i], -1)
}
return text
}
// Replaces user IDs mentioned like this <@userID> to a normal username (eg. @bob)
// This is required so that Mattermost maintains Slack compatibility
// Refer to: https://api.slack.com/changelog/2017-09-the-one-about-usernames
func replaceUserIds(userStore store.UserStore, text string) string {
rgx, err := regexp.Compile("<@([a-zA-Z0-9]+)>")
if err == nil {
userIds := make([]string, 0)
matches := rgx.FindAllStringSubmatch(text, -1)
for _, match := range matches {
userIds = append(userIds, match[1])
}
if res := <-userStore.GetProfileByIds(userIds, true); res.Err == nil {
for _, user := range res.Data.([]*model.User) {
text = strings.Replace(text, "<@"+user.Id+">", "@"+user.Username, -1)
}
}
}
return text
}
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